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I think with the loading you would be better going for less speeds and more robust chains and rings
This seems like a nice idea, but actually the last time chain rollers (and with them chain rings and sprockets) were wider than they are now was in the days of 8-speed. Not sure that Claris is really going to be any more durable than Ultegra :-)
gbj_tester
mi7rennie
I think with the loading you would be better going for less speeds and more robust chains and rings. Tandems are hard on their drive-train.